21047840

素因数分解:

$2^5\times 5^1\times {\mathrm{11}}^1\times {\mathrm{11959}}^1$

素因数の和:11985

約数の個数: 48

約数和(自身を含む): 54250560

約数和(自身を除く): 33202720

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 80, 88, 110, 160, 176, 220, 352, 440, 880, 1760, 11959, 23918, 47836, 59795, 95672, 119590, 131549, 191344, 239180, 263098, 382688, 478360, 526196, 657745, 956720, 1052392, 1315490, 1913440, 2104784, 2630980, 4209568, 5261960, 10523920, 21047840]

約数ペア:

[(1, 21047840), (2, 10523920), (4, 5261960), (5, 4209568), (8, 2630980), (10, 2104784), (11, 1913440), (16, 1315490), (20, 1052392), (22, 956720), (32, 657745), (40, 526196), (44, 478360), (55, 382688), (80, 263098), (88, 239180), (110, 191344), (160, 131549), (176, 119590), (220, 95672), (352, 59795), (440, 47836), (880, 23918), (1760, 11959)]